<style?type="text/css">
????????body?{?margin:?0;?padding:?0;?}
????????.main-2?{?width:?1000px;?background:?blue;?margin:?0?auto;?}
????????.left-2?{?width:?200px;?height:?400px;?position:?absolute;?top:?0;?left:?0;?background:?#555;?}
????????.middle-2?{?width:?500px;?height:?400px;?margin:?0?300px?0?200px;?background:?#666;?}
????????.right-2?{?width:?300px;?height:?400px;?position:?absolute;?right:?0;?top:?0;?background:?#777;?}
????</style><div?class="main-2">
????????<div?class="left-2">200px?#555</div>
????????<div?class="middle-2">500px?#666</div>
????????<div?class="right-2">300px?#777</div>
</div>應(yīng)該用position定位時(shí)是以main-2為基準(zhǔn)的,但是實(shí)際結(jié)果卻是以整個(gè)網(wǎng)頁為基準(zhǔn)的.
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